正解:C
A nation-state is a threat actor that is sponsored by a government or a political entity to conduct cyberattacks against other countries or organizations. Nation-states have large financial resources, advanced technical skills, and strategic objectives that may target critical systems such as military, energy, or infrastructure. Nation-states are often motivated by espionage, sabotage, or warfare12. Reference = 1: CompTIA Security+ SY0-701 Certification Study Guide, page 542: Threat Actors - CompTIA Security+ SY0-701 - 2.1, video by Professor Messer.